Erdheim-Chester Disease: a Rare but Important Cause of Recurrent Pericarditis.

The prevalence of pericardial involvement in ECD is estimated to be 40% and is getting more recognized recently. Up to 68% of patients carry the BRAFV600E mutation, and targeted treatment with vemurafenib, an inhibitor of BRAF kinase, showed an excellent response in those who carry this mutation. Pericardial disease appears to be the most common cardiac presentation (in 80% of cases). Although pericardial involvement is frequently asymptomatic, patients with ECD can present with typical pericarditis chest pain and signs of right heart failure if constriction is present. The diagnosis of ECD requires a biopsy of the pericardium or another affected organ. If BRAFV600E mutation is absent, limited data exist, and many medications have been tried, like interferon alfa, anakinra, and infliximab.